began in the new division by taking the Welsh Light-middleweight title from Dave Davies, who had beaten Thomas three times in the amateurs, in early 1977. Despite the encounter being for a Welsh title, the match took place at The Stadium in Liverpool, the fight being part of the undercard for John Conteh's WBC World Championship bout with Len Hutchins. Thomas' light-middleweight career was far more chequered than his time as a welterweight, losing to Larry Paul, before beating Rhiney and then drawing with Tony Sibson. In 1978 Thomas spent much of his time fighting outside Britain, but with little success. He fought twice in Netherlands, a win and a loss, which were followed by three straight loses, against former Olympic Lightweight Champion Chris Clarke in Canada, then French Champion Claude Martin and finally Spanish fighter Andoni Amana in Bilbao. His fortunes changed on British soil, with wins over Salvo Nucifero and Robbie Davies, before losing to Kenny Bristol in a fight for the vacant British Empire Light-middleweight title by a unanimous points decision. The very next fight was another title decider, this time for the British Light-middleweight belt on 11 September 1979. In that encounter he beat Jimmy Batten in the ninth round to take his second British title; though Batten later stated that he felt he had given the title away as he wasn't in the correct frame of mind due to personal problems. Thomas defended his title successfully twice, knocking out Dave Proud in the seventh and then stopping Steve Hopkin in the final round with a badly cut eye. His third defence ended in defeat, losing to Hensol Graham by points. This was the start of a six-round losing streak that only ended with his retirement from boxing in 1984. Professional boxing record |- |align="center" colspan=8|35 Wins (14 knockouts, 21 decisions), 18 Losses (4 knockouts, 14 decisions), 3 Draws, 1 No Contest |- | align="center" style="border-style: none none solid solid; background: #e3e3e3"|Result | align="center" style="border-style: none none solid solid; background: #e3e3e3"|Record | align="center" style="border-style: none none solid solid; background: #e3e3e3"|Opponent | align="center" style="border-style: none none solid solid; background: #e3e3e3"|Type | align="center" style="border-style: none none solid solid; background: #e3e3e3"|Round | align="center" style="border-style: none none solid solid; background: #e3e3e3"|Date | align="center" style="border-style: none none solid solid; background: #e3e3e3"|Location | align="center" style="border-style: none none solid solid; background: #e3e3e3"|Notes |-align=center |Loss | |align=left| Chris Pyatt |PTS |10 |15 Mar 1984